Browsing by Author "Prabha, C.D."

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    Assay of enzymes in coconut cultivars and hybrids under non-stress and stress conditions
    (2007-02-08) Kasturi Bai, K.V.; Rajagopal, V.; Chempakam, B.; Prabha, C.D.
    Coconut palms of three tall varieties (West Coast Tall (WCT), Philippines Ordinary (PO) and Andaman Ordinary (AO), two dwarf varieties (Malayan Yellow Dwarf (MYD) and Gangabondam (GB)) and three hybrids (WCT x Chowghat Orange Dwarf (COD), COD xWCTand WCT x WCT) were assayed for the activities of stress sensitive enzymes viz., acid phosphatase (APH), L-aspartate : 2 Oxoglutarate amino transferase (AOAT), Superoxide dismutase (SOD), Peroxidase (POD) and Polyphenol Oxidase (PPO) during the two distinct stages viz., non-stress (September / October) and Stress (February / March) of 1989 and 1990. In general, there was stress-induced increase or decrease in the activity of enzymes among the cultivars/hybrids, based on which they were ranked. The cultivar/hybrid with higher activities of SOD and POD and lower activities of PPO, APH and AOAT could be designated as drought tolerant. Accordingly, the order of tolerance was found to be WCT x WCT > WCT > PO = WCT x COfr > AO > GB = COD x WCT > MYD.
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    Evaluation of coconut cultivars and hybrids for dry matter production
    (2007-02) Kasturi Bai, K.V.; Rajagopal, V.; Prabha, C.D.; Ratnambal, M.J.; George, M.V.
    Coconut cultivars/hybrids comprising three tails, one dwarf and five hybrids were evaluated for dry matter (DM) production and yield. The tails excelled in the vegetative dry matter production (VDM) characteristics, whereas the hybrids were superior in the reproductive dry matter production (RDM) and nut yield. Among the hybrids, West Coast Tall (WCT) x Chowghat Orange Dwarf (COD), Laccadive Ordinary (LO) x Gangabondam (GB) and LO x COD performed better than the other two (WCT x WCT and COD x WCT). Copra out-turn was related significantly to RDM as well as total dry matter (TDM) production. Attempt was made to understand the harvest index (HI) in coconut. Traits for higher DM production also were evaluated by correlation studies which indicated the higher dependence of HI on RDM rather than on VDM. Water use efficiency (WUE) also contributed significantly to higher DM production.